Feb 13, 2013 6:00pm EST
the northern city of aleppo. the news comes from one ongoing violence in the capital of damascus, where both sides are fighting for control of key roads. on tuesday, navi pillay, the u.n. commissioner for human rights said that civilians are paying the price. >> the security council is at its best when it acts in a unified voice. a lack of consensus on syria and resulting in action has been disastrous for civilians on all sides. we will be judged against the tragedy that has unfolded before our eyes. this council, as well as those of us in key positions within the un will likely be asked what we did. >> according to navi pillay, the death toll in syria is approaching 70,000. barring the forces have broken up a protest with tear gas and stun grenades. hundreds of people tried to march to a demonstration downtown. more protests are planned as a band to demonstrations. italy's top intelligence official has been sentenced to 10 years in prison for his role in the kit that make up an islamic cleric. nicolo pollari was conducted in 2003. omar was taken to u.s. bases in italy and germany before tak
Feb 13, 2013 8:00am PST
this thing, we could generate electricity to light up cities. and sure enough, we do. and we have devices like this. and we put a waterfall over here and turn it, use the energy of that waterfall, potential, kinetic, rotational, mechanical, off it goes this light, huh? do that, or we could put a steam turbine here, direct some expanding steam against the turbine, against the paddle wheel and turn it. and so our civilization really rests on devices like this. but there's gotta be some energy input to be transformed over here. now, here's a neat little thing. when i turn this and i unscrew the lamp, it becomes easier to turn. easier to turn. why? well, when it's unhooked, there's no energy going off. and so what i'm turning against now is a friction. but when it's hooked up, i'm pushing against the friction plus the electricity. so let's--i can show you that. can i have a volunteer? could you come up here, please? what i'm gonna do-- you stand over here, and what i want you to do-- i'm not gonna look, i'm gonna look over here, okay? and i want you to unscrew that, and i'll tell you when it'